A ball moves horizontally in a closed box making several collisions with the walls. The box is kept on a smooth horizontal surface. During the motion of the ball, the velocity of the center of mass :

of the box remains constant.

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of the box plus the ball system remains constant.

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of the ball remains constant.

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of the ball relative to the box remains constant.

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Solution

The correct option is B of the box plus the ball system remains constant.
Consider your system as the box + ball.
All forces acting on the system are internal (equal and opposite)
i.e. net force acting on the system is zero.
i.e. the velocity of center of mass remains constant.

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A ball moves horizontally in a closed box making several collisions with the walls. The box is kept on a smooth horizontal surface. During the motion of the ball, the velocity of the center of mass :

The correct option is B of the box plus the ball system remains constant.Consider your system as the box + ball.All forces acting on the system are internal (equal and opposite)i.e. net force acting on the system is zero.i.e. the velocity of center of mass remains constant.

The correct option is B of the box plus the ball system remains constant.
Consider your system as the box + ball.
All forces acting on the system are internal (equal and opposite)
i.e. net force acting on the system is zero.
i.e. the velocity of center of mass remains constant.